1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 */ 5 #include <linux/kernel.h> 6 #include <linux/acpi.h> 7 #include <linux/atomic.h> 8 #include <linux/delay.h> 9 #include <linux/init.h> 10 #include <linux/interrupt.h> 11 #include <linux/irqchip.h> 12 #include <linux/kernel_stat.h> 13 #include <linux/proc_fs.h> 14 #include <linux/mm.h> 15 #include <linux/sched.h> 16 #include <linux/seq_file.h> 17 #include <linux/kallsyms.h> 18 #include <linux/uaccess.h> 19 20 #include <asm/irq.h> 21 #include <asm/loongson.h> 22 #include <asm/setup.h> 23 24 DEFINE_PER_CPU(unsigned long, irq_stack); 25 DEFINE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat); 26 EXPORT_PER_CPU_SYMBOL(irq_stat); 27 28 struct acpi_vector_group pch_group[MAX_IO_PICS]; 29 struct acpi_vector_group msi_group[MAX_IO_PICS]; 30 /* 31 * 'what should we do if we get a hw irq event on an illegal vector'. 32 * each architecture has to answer this themselves. 33 */ 34 void ack_bad_irq(unsigned int irq) 35 { 36 pr_warn("Unexpected IRQ # %d\n", irq); 37 } 38 39 atomic_t irq_err_count; 40 41 asmlinkage void spurious_interrupt(void) 42 { 43 atomic_inc(&irq_err_count); 44 } 45 46 int arch_show_interrupts(struct seq_file *p, int prec) 47 { 48 #ifdef CONFIG_SMP 49 show_ipi_list(p, prec); 50 #endif 51 seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count)); 52 return 0; 53 } 54 55 static int __init early_pci_mcfg_parse(struct acpi_table_header *header) 56 { 57 struct acpi_table_mcfg *mcfg; 58 struct acpi_mcfg_allocation *mptr; 59 int i, n; 60 61 if (header->length < sizeof(struct acpi_table_mcfg)) 62 return -EINVAL; 63 64 n = (header->length - sizeof(struct acpi_table_mcfg)) / 65 sizeof(struct acpi_mcfg_allocation); 66 mcfg = (struct acpi_table_mcfg *)header; 67 mptr = (struct acpi_mcfg_allocation *) &mcfg[1]; 68 69 for (i = 0; i < n; i++, mptr++) { 70 msi_group[i].pci_segment = mptr->pci_segment; 71 pch_group[i].node = msi_group[i].node = (mptr->address >> 44) & 0xf; 72 } 73 74 return 0; 75 } 76 77 static void __init init_vec_parent_group(void) 78 { 79 int i; 80 81 for (i = 0; i < MAX_IO_PICS; i++) { 82 msi_group[i].pci_segment = -1; 83 msi_group[i].node = -1; 84 pch_group[i].node = -1; 85 } 86 87 acpi_table_parse(ACPI_SIG_MCFG, early_pci_mcfg_parse); 88 } 89 90 static int __init get_ipi_irq(void) 91 { 92 struct irq_domain *d = irq_find_matching_fwnode(cpuintc_handle, DOMAIN_BUS_ANY); 93 94 if (d) 95 return irq_create_mapping(d, EXCCODE_IPI - EXCCODE_INT_START); 96 97 return -EINVAL; 98 } 99 100 void __init init_IRQ(void) 101 { 102 int i; 103 #ifdef CONFIG_SMP 104 int r, ipi_irq; 105 static int ipi_dummy_dev; 106 #endif 107 unsigned int order = get_order(IRQ_STACK_SIZE); 108 struct page *page; 109 110 clear_csr_ecfg(ECFG0_IM); 111 clear_csr_estat(ESTATF_IP); 112 113 init_vec_parent_group(); 114 irqchip_init(); 115 #ifdef CONFIG_SMP 116 ipi_irq = get_ipi_irq(); 117 if (ipi_irq < 0) 118 panic("IPI IRQ mapping failed\n"); 119 irq_set_percpu_devid(ipi_irq); 120 r = request_percpu_irq(ipi_irq, loongson_ipi_interrupt, "IPI", &ipi_dummy_dev); 121 if (r < 0) 122 panic("IPI IRQ request failed\n"); 123 #endif 124 125 for (i = 0; i < NR_IRQS; i++) 126 irq_set_noprobe(i); 127 128 for_each_possible_cpu(i) { 129 page = alloc_pages_node(cpu_to_node(i), GFP_KERNEL, order); 130 131 per_cpu(irq_stack, i) = (unsigned long)page_address(page); 132 pr_debug("CPU%d IRQ stack at 0x%lx - 0x%lx\n", i, 133 per_cpu(irq_stack, i), per_cpu(irq_stack, i) + IRQ_STACK_SIZE); 134 } 135 136 set_csr_ecfg(ECFGF_IP0 | ECFGF_IP1 | ECFGF_IP2 | ECFGF_IPI | ECFGF_PMC); 137 } 138